16191551 has 2 divisors, whose sum is σ = 16191552. Its totient is φ = 16191550.

The previous prime is 16191529. The next prime is 16191583. The reversal of 16191551 is 15519161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16191551 - 2¹⁴ = 16175167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16191451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8095775 + 8095776.

It is an arithmetic number, because the mean of its divisors is an integer number (8095776).

Almost surely, 2^16191551 is an apocalyptic number.

16191551 is a deficient number, since it is larger than the sum of its proper divisors (1).

16191551 is an equidigital number, since it uses as much as digits as its factorization.

16191551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 29.

The square root of 16191551 is about 4023.8726371494. The cubic root of 16191551 is about 252.9858032830.

The spelling of 16191551 in words is "sixteen million, one hundred ninety-one thousand, five hundred fifty-one".